The Worm that could....

http://www.foxnews.com/scitech/2010/11/26/secret-agent-crippled-irans-nuclear-ambitions/
This article states that a new, powerful computer worm had taken down Iran 's nuclear programs by damaging it, but not completely destroying it. The worm's progress and what it did were listed and explained throughout the article. However, the source of the worm remains unknown as it destroyed its connection from the source before it could be analyzed. It was said to be so advanced and was made to make sure Iran's nuclear programs were failing, but never know why they were. This worm was called "Stuxnet" and it did the job secret agents would have done,  taken down a Nuclear program and have time to get out of there ( dead or alive of course ) . This has been called the first "weaponized" computer virus and it has caused a major rethinking of computer security around the globe.